Mega Man Legends 3 is a cancelled video game set to be the sequel to Mega Man Legends 2 and the fourth game in the Mega Man Legends series. It was announced for the Nintendo 3DS on September 29, 2010, during a Nintendo press conference for the 3DS.

Mega Man Legends is sub-series in the Mega Man franchise. While the main series is known for its 2D side-scrolling platformer gameplay with story that is told through cutscenes, this series instead features 3D action-adventure gameplay and a more detailed story.